[EN] A PROCESS FOR THE PREPARATION OF ALKYLIDENECYCLOPENTANONE DERIVATIVES<br/>[FR] PROCÉDÉ DE PREPARATION DE DÉRIVÉS D'ALKYLIDÈNECYCLOPENTANONE
申请人:FIRMENICH & CIE
公开号:WO2004043895A1
公开(公告)日:2004-05-27
The present invention relates to the field of organic synthesis and more particularly to a new process for the preparation of a compound of formula (I), in the form of any one of its isomers or a mixture thereof, Formula (I) wherein, more preferably, G represents a C=O group, R1 represents a butyl group and R2 represents a methyl group. The process of the invention involves an 2-(1-hydroxyalkyl)-cyclopent-2-en-1-one derivative, as starting material, which can be then converted into a compound of formula (I) by a process comprising a thermal rearrangement. The 2-alkylidene-3-oxo-cyclopentylacetate derivative and the 2-(1-hydroxyalkyl)-cyclopent-2-en-1-one derivative are also an object of the invention.
本发明涉及有机合成领域,更具体地涉及一种制备化合物(I)的新工艺,其形式为其任一异构体或其混合物,其中,更优选地,G代表C=O基团,R1代表丁基基团,R2代表甲基基团。该发明的工艺涉及以2-(1-羟基烷基)-环戊-2-烯-1-酮衍生物作为起始材料,该衍生物可以通过热重排的过程转化为化合物(I)。2-烷基亚甲基-3-氧代-环戊基乙酸酯衍生物和2-(1-羟基烷基)-环戊-2-烯-1-酮衍生物也是本发明的对象。